Clef and Soprano clef

Clef noun - A musical notation written on a staff indicating the pitch of the notes following it.

Soprano clef and clef are semantically related. In some cases you can replace phrase "Soprano clef" with "Clef", this terms are similar.

Soprano clef noun - A clef that puts middle C on the bottom line of the staff.

Clef and soprano clef are semantically related. You can use "Clef" instead a noun phrase "Soprano clef".